Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	$ 835	$ 953	$ 958
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(195)	(192)	(175)
Payments for acquisitions of businesses, net of cash acquired		(511)	(9)
Net proceeds from sale (purchases) of investments	28	(4)	14
Other investing activities	29	42	54
Net cash (used in) provided by investing activities from continuing operations	(138)	(665)	(116)
Cash flows from financing activities:
Proceeds from long-term debt	1,469	1,189	748
Repayments of long-term debt, including premium and costs	(1,642)	(1,226)	(1,060)
Purchases of treasury stock	(634)	(533)	(413)
Other financing activities	101	72	54
Net cash used in financing activities from continuing operations	(706)	(498)	(671)
Net change in cash and cash equivalents from continuing operations	(9)	(210)	171
Net cash flows from (to) discontinued operations	30	(16)	29
Beginning balance	337	563	363
Ending balance	358	337	563
Parent Company
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	(168)	(10)	(4)
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(4)	(13)	(6)
Payments for acquisitions of businesses, net of cash acquired			(13)
Other investing activities	815	311	952
Net cash (used in) provided by investing activities from continuing operations	811	298	933
Cash flows from financing activities:
Proceeds from long-term debt	1,469	1,143	748
Repayments of long-term debt, including premium and costs	(1,592)	(1,223)	(1,056)
Purchases of treasury stock	(634)	(533)	(413)
Other financing activities	96	71	51
Net cash used in financing activities from continuing operations	(661)	(542)	(670)
Net change in cash and cash equivalents from continuing operations	(18)	(254)	259
Net cash flows from (to) discontinued operations	30	(16)	29
Beginning balance	73	343	55
Ending balance	85	73	343
Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	731	737	749
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(144)	(144)	(135)
Payments for acquisitions of businesses, net of cash acquired		(473)
Net proceeds from sale (purchases) of investments	2	3
Other investing activities	32	42	22
Net cash (used in) provided by investing activities from continuing operations	(110)	(572)	(113)
Cash flows from financing activities:
Repayments of long-term debt, including premium and costs	(6)	(3)	(4)
Other financing activities	(620)	(159)	(734)
Net cash used in financing activities from continuing operations	(626)	(162)	(738)
Net change in cash and cash equivalents from continuing operations	(5)	3	(102)
Beginning balance	71	68	170
Ending balance	66	71	68
Non-Guarantor Subsidiaries
Cash flows from operating activities:
Net cash provided by (used in) operating activities from continuing operations	272	226	213
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(47)	(35)	(34)
Payments for acquisitions of businesses, net of cash acquired		(38)	4
Net proceeds from sale (purchases) of investments	26	(7)	14
Other investing activities	(1)		6
Net cash (used in) provided by investing activities from continuing operations	(22)	(80)	(10)
Cash flows from financing activities:
Proceeds from long-term debt		46
Repayments of long-term debt, including premium and costs	(44)
Other financing activities	(192)	(151)	(189)
Net cash used in financing activities from continuing operations	(236)	(105)	(189)
Net change in cash and cash equivalents from continuing operations	14	41	14
Beginning balance	193	152	138
Ending balance	207	193	152
Eliminations
Cash flows from investing activities:
Other investing activities	(817)	(311)	(926)
Net cash (used in) provided by investing activities from continuing operations	(817)	(311)	(926)
Cash flows from financing activities:
Other financing activities	817	311	926
Net cash used in financing activities from continuing operations	$ 817	$ 311	$ 926